I'm going to guess you've been asked this a fair few times, but I can't work out how to search!
I bought my gf a
BASIC Sex Toys Slimline Butt Buddy Butt Plug
http://www.lovehoney.co.uk/product.cfm?p=16053 , and we've had fun with it over the last couple months, but now I want something bigger for her to try!
Anyone have suggestions for the next step up? Something that holds firm but not too big :)